Time-Lapse Electromagnetic Monitoring

摘要

A time-lapse electromagnetic (EM) monitoring system for a formation includes at least one EM source and at least one EM field sensor to collect EM survey data corresponding to the formation in response to an emission from the at least one EM source. The EM survey data includes first EM data collected at a first time and second EM data collected at a second time. The time-lapse EM monitoring system also includes a processing unit in communication with the at least one EM field sensor. The processing unit determines time-lapse EM data based on the first EM data and the second EM data, and performs an analysis of the time-lapse EM data to determine an attribute change in an earth model.

主权项

1. A time-lapse electromagnetic (EM) monitoring system for a formation, comprising:
at least one EM source; at least one EM field sensor to collect EM survey data corresponding to the formation in response to an emission from the at least one EM source, wherein the EM survey data includes first EM data collected at a first time and second EM data collected at a second time; and a processing unit in communication with the at least one EM field sensor, wherein the processing unit determines a perturbation tensor that defines a relationship between the first EM data and the second EM data, wherein the processing unit determines observed time-lapse EM data based on the first EM data and the second EM data, and wherein the processing unit performs an analysis of the observed time-lapse EM data to determine an attribute change in an earth model.